Question

The outline is not placed correct on inline-elements in Firefox. There is a space between background and outline.

Any suggestions to avoid that?

strong
{
    background: #3690f0;
    color: white;
    outline: 1px solid black;
}

http://jsfiddle.net/Yz9cA/

Answer 1

Firefox has a bug in drawing outline (see more here: https://bugzilla.mozilla.org/show_bug.cgi?id=480888). You can workaround utilizing box-shadow:

strong
{
    background: #3690f0;
    color: white;
    box-shadow: 0px 0px 0px 1px rgba(0,0,0,1);
}